Asynchrony in image analysis: using the luminance-to-response-latency relationship to improve segmentation

We deal with the probiem of segmenting static images, a procedure known to be difficult in the case of very noisy patterns, The proposed approach rests on the transformation of a static image into a data flow in which the first image points to be processed are the brighter ones. This solution, inspired by human perception, in which strong luminances elicit reactions from the visual system before weaker ones, has led to the notion of asynchronous processing. The asynchronous processing of image points has required the design of a specific architecture that exploits time differences in the processing of information. The results otained when very noisy images are segmented demonstrate the strengths of this architecture; they also suggest extensions of the approach to other computer vision problem

Swift Observations of X-ray supernovae

We present a result of X-ray supernovae (SNe) survey using the Swift satellite public archive. An automatic searching program was designed to search X-ray SNe among all of the Swift archival observations between November 2004 and February 2011. Using the C++ program, 24 X-ray detectable supernovae have been found in the archive and 3 of them were newly-discovered in X-rays which are SN 1986L, SN 2003lx, and SN 2007od. In addition, SN 2003lx is a Type Ia supernova which may be the second X-ray detectable Type Ia after SN 2005ke (Immler et al. 2006). Calibrated data of luminous type Ib/c supernovae was consistent to the X-ray emission model done by Chevalier & Fransson (1994). Statistics about the luminosities and hardness ratio have been done to purpose of getting the X-ray emission features of the X-ray supernovae. The results from this work help investigating the X-ray evolution of SNe and developing similar X-ray SNe surveys in various X-rays missions

Opportunistic Scheduling and Beamforming for MIMO-SDMA Downlink Systems with Linear Combining

Opportunistic scheduling and beamforming schemes are proposed for multiuser MIMO-SDMA downlink systems with linear combining in this work. Signals received from all antennas of each mobile terminal (MT) are linearly combined to improve the {\em effective} signal-to-noise-interference ratios (SINRs). By exploiting limited feedback on the effective SINRs, the base station (BS) schedules simultaneous data transmission on multiple beams to the MTs with the largest effective SINRs. Utilizing the extreme value theory, we derive the asymptotic system throughputs and scaling laws for the proposed scheduling and beamforming schemes with different linear combining techniques. Computer simulations confirm that the proposed schemes can substantially improve the system throughput.Comment: To appear in the Proceedings of the 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Athens, Greece, September 3 - 7, 200

Depth Assisted Full Resolution Network for Single Image-based View Synthesis

Researches in novel viewpoint synthesis majorly focus on interpolation from multi-view input images. In this paper, we focus on a more challenging and ill-posed problem that is to synthesize novel viewpoints from one single input image. To achieve this goal, we propose a novel deep learning-based technique. We design a full resolution network that extracts local image features with the same resolution of the input, which contributes to derive high resolution and prevent blurry artifacts in the final synthesized images. We also involve a pre-trained depth estimation network into our system, and thus 3D information is able to be utilized to infer the flow field between the input and the target image. Since the depth network is trained by depth order information between arbitrary pairs of points in the scene, global image features are also involved into our system. Finally, a synthesis layer is used to not only warp the observed pixels to the desired positions but also hallucinate the missing pixels with recorded pixels. Experiments show that our technique performs well on images of various scenes, and outperforms the state-of-the-art techniques

Vaginal hysterectomies in patients without uterine prolapse: a local perspective

OBJECTIVE: To review the results of vaginal hysterectomies in patients without uterine prolapse. DESIGN: Retrospective chart review. SETTING: University affiliated hospital, Hong Kong. PATIENTS: Patients who had vaginal hysterectomies in the absence of uterine prolapse, from 1999 to 2005 inclusive. MAIN OUTCOME MEASURES: The number, indications, operative procedures, and complications of such hysterectomies. RESULTS: A total of 94 patients who underwent vaginal hysterectomy fulfilled the inclusion criteria. They accounted for 4.3 to 8.2% of all hysterectomies performed annually for benign diseases in the department, over the inclusive period 2000 to 2004. The incidences of complications, except bladder injuries, were comparable to those reported in other studies. The incidence of vault haematoma decreased as each surgeon's experience increased and more attention was paid to 'bleeders' at the 'four and eight o'clock areas' and more cephalic regions of the vaginal incision. Increased size of the uterus was an important determinant of the risk of complications. CONCLUSIONS: Vaginal hysterectomy is an underutilised approach in Hong Kong. With more experience and better patient selection, complication rates can be further reduced. Further evaluation is suggested for the role of bleeders at 'four and eight o'clock regions' as potential causes of vault haematoma.published_or_final_versio

Intellectual Property Protection of Integrated Circuits: International Developments and the Case of Hong Kong

Protection of integrated circuits (ICs) is one of the most neglected fields within the area of information technology law. This article reviews the international developments in the protection of ICs and the case of Hong Kong. While Hong Kong has undoubtedly met international standards in this regard by creating a sui generis system for protecting IC topographies, it has yet to deal with a fundamental and unresolved problem, namely, the relationship between the sui generis system and the copyright system. This article investigates the cause of the problem and traces it to two possible legislative oversights in the Copyright Ordinance (Cap 528).published_or_final_versio